Table 3.

Subgroup analysis of the association between serum 25(OH)D levels and the stroke risk based on race.

Race	N (%)	Model 1 OR (95% CI)	P	Model 2 OR (95% CI)	P	Model 3 OR (95% CI)	P
Mexican Americans
25(OH)D, nmol/L
Deficiency (<30)	115 (7.75)	0.762 (0.230-2.524)	0.643	1.015 (0.310-3.320)	0.979	0.868 (0.282-2.671)	0.798
Insufficiency (30-50)	524 (34.98)	0.676 (0.308-1.484)	0.309	0.786 (0.364-1.697)	0.522	0.778 (0.351-1.727)	0.520
Normal (50-125)	878 (57.17)	Ref		Ref		Ref
Adequacy (≥125)	2 (0.10)	-		-		-
Non-Hispanic whites
25(OH)D, nmol/L
Deficiency (<30)	108 (10.62)	4.651 (1.908-11.338)	<0.001	3.087 (1.390-6.856)	0.004	2.501 (1.094-5.720)	0.024
Insufficiency (30-50)	353 (29.13)	1.957 (1.257-3.047)	0.002	1.982 (1.246-3.153)	0.003	1.853 (1.170-2.934)	0.006
Normal (50-125)	731 (59.69)	Ref		Ref		Ref
Adequacy (≥125)	7 (0.56)	0.954 (0.456-1.995)	0.897	0.922 (0.481-1.767)	0.800	1.011 (0.574-1.781)	0.969
Non-Hispanic blacks
25(OH)D, nmol/L
Deficiency (<30)	123 (2.40)	0.746 (0.437-1.273)	0.262	1.009 (0.550-1.851)	0.976	0.837 (0.470-1.492)	0.528
Insufficiency (30-50)	567 (12.43)	0.555 (0.209-1.473)	0.218	0.739 (0.276-1.977)	0.529	0.702 (0.264-1.864)	0.459
Normal (50-125)	3461 (81.65)	Ref		Ref		Ref
Adequacy (≥125)	143 (3.53)	1.739 (0.185-16.329)	0.613	0.819 (0.097-6.899)	0.848	1.298 (0.145-11.605)	0.808
Other races
25(OH)D, nmol/L
Deficiency (<30)	403 (27.69)	0.615 (0.135-2.798)	0.513	1.050 (0.298-3.695)	0.937	0.828 (0.267-2.571)	0.734
Insufficiency (30-50)	582 (39.36)	0.334 (0.089-1.261)	0.092	0.408 (0.107-1.555)	0.172	0.379 (0.095-1.502)	0.151
Normal (50-125)	515 (32.36)	Ref		Ref		Ref
Adequacy (≥125)	11 (0.60)	-		-		-

Notes: model 1 is the univariate logistic regression analysis for 25(OH)D levels; model 2 is the multivariate logistic regression analysis after adjustments for age and gender; model 3 is the multivariate logistic regression analysis after adjustment for the covariates including age, gender, BMI, educational level, hypertension, vitamin B, and CRP levels.